Trouble with beta4 drivers

I'm running Ubuntu 9.04 amd64. I set up ati-stream-sdk-v2.0-beta4-lnx64.tgz without trouble. I can compile and run the example programs on my cpu (if I copy libaticalrt.so and libaticalcl.so to $ATISTREAMSDKROOT/lib/x86_64/).

I wanted to take the next step, and get code running on my Radeon Mobility 4830. I extracted ati-opencl-beta-driver-v2.0-beta4-lnx.zip. In the fglrx-8.67/ directory, I run "sudo ./ati-driver-installer-8.67-x86.x86_64.run". Everything appears to build and install successfully. The kernel module can load without trouble, but I get a black screen when X starts. It appears as though my computer has completely locked up.

If I remove the fglrx.ko kernel module, then X will start and not hang the system. I get the "For testing" AMD logo in the lower right corner of the screen. 2D performance is absolutely awful, and I get an error when I try to run my openCL applications. After the expiration message printout, I get an "X Error of failed request: ..." and then some information about failed request opcodes.